I know of a couple of circumstances where a straight pipe was put in place of a broken-off muffler simply to get back to work right away. Most times though, its just showboating. A few of my occasional-use tractors around here have straight pipes because I like to hear them bark, but I also wear hearing protection when running them too. For anything that I run often, muffler stays on, not only to keep the noise down, but to maintain full power. Yes, despite what some people think, most stock engines are designed to run with a certain amount of exhaust backpressure. I'm not an engineer, don't ask me to explain it. I will say that it was very noticeable when I switched from straight pipe to muffler on my Oliver 990 with 3-71 Detroit. With straight pipe, it would pull down just a little, then completely fall off. With muffler, it will actually pull down on the revs and keep chugging through, and will only fall off after losing maybe a third of its revs. Pullers running stock Detroits are only shooting themselves in the foot by running a straight pipe.
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Today's Featured Article - Restoration Story: 1951 Farmall H - by The Red (John Fritz). I have been a collector of Farmall tractors since 1990 when I first obtained part of the family farm in Eastern Indiana. My current collection includes a 1938 F20, 1945 H, 1946 H, and the recently purchased 1951 H. This article will focus on what I encountered and what I did to bring the 1951 NEAR DEATH Farmall H back to life.
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